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  3. After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recove

After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recove

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问题     After a busy day of work and play, the body needs to rest. Sleep is necessary for good health. During this time, the body recovers from the activities of the previous day. The rest that you get while sleeping enables your body to prepare itself for the next day.
    There are four levels of sleep, each being a little deeper than the one before. As you sleep, your muscles relax little by little. Your heart beats more slowly, and your brain slows down. After you reach the fourth level, your body shifts back and forth from one level of sleep to the other.
    Although your mind slows down, from time to time you will dream. Scientists who study sleep state that when dreaming occurs, your eyeballs begin to move more quickly (Although your eyelids are closed). This stage of sleep is called REM, which stands for rapid eye movement.
    If you have trouble falling asleep, some people recommend breathing very deeply. Other people believe that drinking warm milk will help make you drowsy. There is also an old suggestion the counting sheep will put you to sleep!
During REM, ________.
选项 A、your eyes move quickly
B、you dream
C、you are restless
D、both A and B
答案D
解析 细节理解题。根据第三段的内容可知，快速眼动 (REM) 指在做梦时，你的眼球开始快速移动 (尽管你的眼皮是闭着的)。故选D。
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